| US 7,514,867 B2 | ||
| LED lamp provided with optical diffusion layer having increased thickness and method of manufacturing thereof | ||
| Tadashi Yano, Kyoto (Japan); Kiyoshi Takahashi, Kyoto (Japan); and Masanori Shimizu, Kyoto (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 10/582,329 PCT Filed Apr. 08, 2005, PCT No. PCT/JP2005/006959 § 371(c)(1), (2), (4) Date Jun. 09, 2006, PCT Pub. No. WO2005/104247, PCT Pub. Date Nov. 03, 2005. |
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| Claims priority of application No. 2004-122550 (JP), filed on Apr. 19, 2004. | ||
| Prior Publication US 2008/0074032 A1, Mar. 27, 2008 | ||
| Int. Cl. H05B 33/00 (2006.01) | ||
| U.S. Cl. 313—512 [313/501; 313/486; 313/110; 313/112; 445/24; 445/25; 257/98; 257/100] | 13 Claims |
| 8. An LED lamp comprising:
at least one LED chip that is mounted on a substrate;
a phosphor resin portion that covers at least the upper surface of the LED chip;
a lens to act on the outgoing light of the phosphor resin portion; and
an optical diffusion layer, which is arranged between the phosphor resin portion and the lens and in which particles to scatter
the light are dispersed,
wherein the thickness of the optical diffusion layer on the upper surface of the phosphor resin portion is greater around
the periphery of the upper surface than around the center of the upper surface;
wherein the phosphor resin portion has a cylindrical shape.
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